Here \(Q_i\)  and \(L_i\)  are the SM left-handed quark and lepton doublets of each generation, respectively whereas \(\lambda _{Q_i}\)  and \(\lambda _{L_i}\)  are the corresponding new physics couplings. The stability of the DM particle is achieved by imposing a \({\cal Z}_2\)  parity and assuming \(m_{\phi _{q,l}} > m_{\chi }\) . Under \({\cal Z}_2\)  symmetry, the SM fields are invariant. The quantum numbers of the new fields along with the charges under \({\cal Z}_2\)  symmetry are presented in Table REF . In [1]}, it was shown that this model can accommodate the current measurements in \(b \rightarrow s \mu ^+ \mu ^-\)  sector along with reproducing the observed dark matter relic density provided the new physics couplings are complex.
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